president obama and mitt romney, one on one, wednesday night, denver, colorado. let me bring in chief political analyst gloria borger with a preview and, gloria, hit this home for me. we talked about how crucial this is, really, for both of these men. we say how crucial, really how crucial is it? >> well, i don't think the stakes can get any higher. this isn't as if you have 20 primary debates like you did for the republicans during the primary season. you got a few times for both mitt romney and president obama to show their stuff, this first debate is huge. largely because the race is tight, in the battleground states, the president seems to be really gaining an advantage. and generally, you know, you can't decide as a voter to fire somebody until you're sure that the replacement can do a good job. this is that moment when you're going to have a huge audience and if you're mitt romney, you have to explain to american voters why you can be commander in chief, and why you would be the replacement for president obama. >> isn't so much of this, though, leading up t